Biblioteca del Congreso de los EEUU http://id.loc.gov/authorities/names/n79120269
Biblioteca Nacional Alemana http://d-nb.info/gnd/004271742
VIAF http://viaf.org/viaf/138892616
Fuente consultada Report of the National Executive Committee to the 38th Annual Conference ..., 1939?
Información encontrada port. (Labour Party)